Year	current US$
1977	5589999.923482541
1980	28280000.31784178
1981	29870000.319555417
1982	20889999.678358443
1983	20189999.533817165
1984	14879999.998956919
1985	28810000.44010575
1986	20839999.858289953
1987	20200000.312179323
1988	24040000.168606605
1989	31640000.4606694
1990	19650000.07674097
1991	26690000.282600515
1992	27059999.866411064
1993	25989999.987184986
1994	31789999.44590033
1995	29600000.411272045
1996	24779999.956488617
1997	24040000.15929342
1998	26579999.512061473
1999	26070000.335574146
2000	20499999.783933163
2001	27910000.575706355
2002	29169999.93287027
2003	29160000.132396813
2004	32189999.55058099
2005	34150000.00596047
2006	32690000.146627422
2007	34689999.99761582
2008	40030000.00119208
2009	36280000.68664552
2010	39909999.489784226
2011	37940000.17642975
2012	38460896.03984729
2013	48768214.10167028
2014	39608759.731054306
2015	33405327.52871512
2016	24288697.868585594
2017	17573185.980319973
2018	19707109.868526448
2019	28281386.554241173
2020	29943020.045757305
2021	29407440.066337563
2022	33248920.619487762